Investigation of operational parameters for an industrial CFB combustor of coal,biomass and sludge

作     者：Manon Van de Velden Jan Baeyens Bill Dougan Alan McMurdo 

作者机构：Department of Chemical Engineering University of Birmingham B15 2TT Birmingham United Kingdom UPM-KymmeneCaledonian Paper Ltd.AyrUnited Kingdom 

出 版 物：《China Particuology》 (CHINA PARTICUOLOGY)

年 卷 期：2007年第5卷第4期

页      面：247-254页

核心收录：

学科分类：080703[工学-动力机械及工程] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：Manon Van de Velden passed away on 21 March 2007 

主　　题：Circulating fluidized bed Combustion Coal Biomass Operation Cyclone 

摘      要：The combustion of coal and/or biomass （sludge, wood waste, RDF, etc.） in a circulating fluidized bed has been a commercial topper for over 20 years, and references to principles and applications are numerous and widespread although few data are presented concerning the operation of large scale CFB-units. The authors studied the CFB-combustion at UPM-Kymmene （Ayr）, a major paper mill relying for its steam production upon the combustion of coal （80-85 %）, wood bark （5-10%） and wastewater treatment sludge （5-10%）. The maximum capacity of the CFB is 58 MWth. A complete diagnostic of the operation was made, and additional tests were performed to assess the operating mode. The plant schematics, relevant dimensions and process data are given. To assess the operation of the UPM-CFB, it is important to review essential design parameters and principles of CFB combustors, which will be discussed in detail to include required data, heat balance and flowrates, operating versus transport velocity, kinetics and conversion （including the possible effect of the Bouduard reaction if carbon is present）. Since the residence time in the riser and the cyclone efficiency determine the burnout of circulating fuel-particles, the UPM-CFB was subjected to a stimulus response technique using nickel oxide as tracer. Results illustrate the efficiency of the cyclone separation and the number of recycle loops for particles of a given size. Results will also be used to assess the cyclone operation and efficiency and to comment upon expected and measured carbon conversion.